It is a very basic initial test, using wrong parameters, timing, etc. will come later, it is out of scope now.

ABP

Started test with a simple ABP setup sending 4 bytes data with DR5 (SF7) in every 10 seconds unconfirmed.

Setting keys

Setting of DevAddr, NwkSkey and AppSkey works as expected, no issue found.

Setting of port and DR

Setting port used to send data and selecting DR in 0-5 (SF12-SF7) range works as expected.

Uplink sequence numbers

Works as expected, LoRaWAN stack increments it from 1 by packets.

Frequency usage

LoPy is using only the 3 mandatory channels, 868,100, 868.300 and 868.500 MHz which is a safe choice, but in real life gateways offer 8 channels. Would be better to have the Semtech 8-channels bandplan as default and to offer different bandplan optionally as a 868 MINIMAL setup or to add/remove channels using the API.

Stability

Now the test run is over 2,170 packets and still running. No errors, no out of memory. Looks good!

@jubbs : This might be a problem of the packet counter. ABP starts at zero if you do a reset on LoPy. As long as your counter on Loriot is higher than your counter from your node, messages are ignored.
Try to reset your ABP counter in Loriot dashboard

@jubbs : This might be a problem of the packet counter. ABP starts at zero if you do a reset on LoPy. As long as your counter on Loriot is higher than your counter from your node, messages are ignored.
Try to reset your ABP counter in Loriot dashboard